Navigation RTML features help improve navigation for your online store for users as well as they make your Yahoo! Store Search Engine friendly as well.

Navigation is the key element of your online store that guides users through your products and pages. A user friendly navigation structure can guide the users reach your products easily and it can increase conversion on your Yahoo! Store. Navigation elements can also be used for making your Yahoo! Store friendlier to search engines.
Our navigation features make it easier for your visitors to browse your store and help them find exactly what they are looking for quicker. Boost your online yahoo store sales with a makeover that will bowl over your customer.

The checkout manager of your Yahoo! Store is not RTML driven. What does that mean to you? The look and feel of your store does not continue through to the cart and checkout pages of your site automatically.

The "add to cart" button is VERY important! It is the ONLY one you want your customers clicking on your item page, isn't it? The "add to cart" button should be easy to find, easy to remember, and easy to use.